Speaker
Description
Precise time tagging of particles become a pivotal ingredient in designing high-energy physics experiments. Low-Gain Avalanche Diodes (LGADs) with an active thickness of $\sim$ 50 $\mu$m have proved the ability of silicon sensors to provide precise timing down to about 30 ps. Such timing performance is maintained almost unchanged up to a fluence of 2.5$\cdot$10$^{15}$ 1 MeV equivalent n/cm$^2$. Thinner substrates can further improve the timing resolution of the LGAD sensors.
At the end of 2022, FBK released a batch of thin LGAD sensors with an active thickness between 15 and 45 $\mu$m to investigate the effect of the thickness in improving sensor performances.
The state-of-the-art design of the LGAD gain implant from FBK has been used on thin substrates, exploiting the concurrent implantation of boron and carbon atoms in the multiplication region typical of LGAD sensors, resulting in the most radiation-tolerant LGADs ever produced by FBK.
In December 2024, thin LGAD sensors were tested on an electron beam at the DESY facility (Hamburg, Germany). Their timing performances will be presented. In particular, the impact of the sensor thickness on the collected charge and the timing resolution will be explored and discussed.
